BirdAnalyst
Species · Delaware · BBS 2025 Release · 1966–2024

Field Sparrow Population Trend in Delaware

All statesGeneralists

Field Sparrow in Delaware has fallen sharply: down 54% on the route-weighted index since 1968.

-54%Since 1968
17Routes In State
58Years

Notable Field Sparrow Trends in Delaware

long arc declinecomputed index

Field Sparrow has fallen sharply in Delaware: down 54% on the route-weighted index since 1968.

Field Sparrow Population Forecast in Delaware

If the recent trend holds, Field Sparrow in Delaware is projected to fall about 68% by 2029 — from 7.8 in 2024 to a central estimate of 2.5 (95% range 0.00–7.6). A 5-year backtest shows a typical error of ±58.5%, with 60% of held-out values landing inside the 95% band.

-68%Change by 2029
2.5Projected 2029 index
0.00–7.695% range
±58.5%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20253.10.008.2
20262.90.008.1
20272.80.007.9
20282.60.007.8
20292.50.007.6

Field Sparrow Survey Routes in Delaware

Routes recording Field Sparrow in Delaware.
Blackbird1720241994
Lowes Xrds1219911966
Millsboro720242017
Holleyville 2720242006
Holleyville620041966
Harrington420241966
Frankford420121966
Milton420161966
Pepperbox420161998
Pepperbox 2420242017
Wilmington320141966
Bethany Bch319891966
Milton 2320172017
Mt Pleasant220191966
Frederica220141966
Dover219851966
Georgetown220221992

Field Sparrow Population Trend in Other States

alabamaarkansascoloradoconnecticutfloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.